Displaying items by tag: ground granulated blast furnace slag

From the Nordics to the Mediterranean, European countries lead the field in reduced-clinker cement production using supplementary cementitious materials (SCMs). While consumers, faced with ever-greater choice, continue to opt for sustainability, projects to improve existing SCMs and develop new ones have won government backing and have become a matter of serious investment for other heavy industries beside cement. European cement producers’ decisions are steering the course to a world beyond CEM I. Yet, even in Europe, great untapped potential remains.

Companies generated a good deal of marketing buzz around their latest reduced-CO₂ cement ranges in 2021 and the first quarter of 2022: Buzzi Unicem’s CGreen in Germany and Italy, Holcim’s EcoPlanet in six markets from Romania to Spain, Cementir Holding’s Futurecem in Denmark and Benelux, and Cemex’s Vertua in Spain and several other countries. All boast reduced clinker factors through the use of alternative raw materials. This, however, is really a rebranding of a long-established norm in Europe.

Since 2010, cements other than CEM I have constituted over 75% of average annual cement deliveries across Cembureau member countries (all cement-producing EU member states, plus Norway, Serbia, Switzerland, Turkey, the UK and Ukraine). This statistic breaks down differently from country to country. CEM II is the norm in Austria, Finland, Portugal and Switzerland, with deliveries in the region of 90%. Portland limestone cement (PLC) makes up a majority of deliveries in all four. It has been central to Switzerland’s transition to 89% (3.72Mt) of CEM II deliveries out of a total 4.18Mt of cement despatched in 2021. There, the main types of cement were CEM II/B-M (T-LL) Portland composite cement, with 1.38Mt (33%), and two different classifications of PLC: CEM II/A-LL PLC, with 1.28Mt (31%), and CEM II/B-LL PLC, with 888,000t (21%).

A second approach is that of the Netherlands, where CEM III blast furnace slag cement with a clinker factor below 65% predominates, favoured for its sulphate resistance and the protection it offers against chloride-initiated corrosion of steel reinforcement in marine settings. By contrast, the UK has traditionally maintained a higher reliance on CEM I cement. This can be partly explained by the preference of builders there for adding fly ash or ground granulated blast furnace slag (GGBFS) at the mixing stage. Nonetheless, CEM II Portland fly ash cement held a 14% (1.43Mt) market share in the UK’s 10.2Mt of cement consumption in 2021.

The UK Mineral Products Association (MPA) has identified limestone as an underutilised resource in the country’s cement production. Together with HeidelbergCement subsidiary Hanson Cement, it has applied for a change to National Application standards to allow the production of Portland composite cement from fly ash and limestone or GGBFS and limestone. The association has forecast that Portland composite cement could easily rise to 30 – 40% of UK cement consumption, and that this has the potential to eliminate 8% of the sector’s 7.8Mt/yr-worth of CO₂ emissions.

Metallurgical waste streams have long flowed into European cement production, primarily as GGBFS, but also as bauxite residue. In 2021, alumina production in the EU alone generated 7Mt of bauxite residue, of which the bloc recycled just 100,000t (1.4%) that year. Two projects – the Holcim Innovation Center-led ReActiv project and Titan Cement and others’ REDMUD project – aim to produce new alternative cementitious materials from bauxite residue.

By collaborating with other industries, cement producers’ investments can most effectively reduce the overall cost of using these materials in cement production. In Germany, HeidelbergCement and ThyssenKrupp’s Save CO₂ project aims to develop new improved latent hydraulic binders or alternative pozzolan from GGBFS by producing slag from directly reduced iron (DRI). The Save CO₂ team believes that GGBFS substitution for clinker has the capacity to eliminite 200Mt/yr of CO₂ emissions from global cement production.

Meanwhile in the world of mining, ThyssenKrupp and others’ NEMO project is investigating the recovery of a useable mineral fraction for cement production from the extractive waste of the Luikonlahti and Sotkamo mines in Finland and the Tara mine in Ireland, through bioleaching and cleaned mineral residue upcycling. This may give cement producers full access to Europe’s 28Bnt stockpiles of sulphidic mining waste, of which mines generate an additional 600Mt each year.

Denmark-based CemGreen, which produces the calcined clay supplementary cementitious material CemShale, is developing a shale granule heat-treating technology called CemTower. This consists of three pieces of equipment vertically integrated into cement plants’ preheaters, kilns and coolers, and brings the processing of waste materials – here oil shale – to the cement plant.

Lastly, cement producers are exploring the possible uses of waste made of cement itself. In Wallonia, HeidelbergCement subsidiary CBR’s CosmoCem project is investigating the production of alternative cement additives from large available flows of local demolition, soil remediation and industrial waste. Similarly, the Greece-based C2inCO₂ project seeks to mineralise fines from concrete recycling for HeidelbergCement to use in the production of novel cements in its Greek operations.

In Switzerland, ZND Portland composite cement (produced using fine mixed granulate from building demolitions) is the third largest cement type, with 178,000t (4.3%) of total deliveries – narrowly behind CEM I with 239,000t (5.7%).Holcim Schweiz developed its Susteno 4 ZND Portland composite cement with Switzerland’s lack of any ash or slag supply in mind, demonstrating the potential flexibility of a circular economic approach to cement production.

On 21 March 2022, the University of Trier reported that it is in the process of mapping mineral resources, waste deposits and usable residues ‘on a cross-border scale,’ in an effort to produce new materials for use in cement production. Industry participants include France-based Vicat, CBR, Buzzi Unicem subsidiary Cimalux and CRH subsidiary Eqiom. Vicat is preparing a kiln at its 1Mt/yr Xeuilley cement plant in Meurthe-et-Moselle to use in testing new alternative raw materials developed under the project.

For Cembureau and its members, work continues, with the goal of Net Zero by 2050 constantly in sight. This goal includes a reduction in members’ clinker-to-cement ratios to well below 65%. In this, the association and its members are working towards a world not just beyond CEM I, but beyond CEM II, too. What exactly this will mean remains to be seen.

Sources

CemSuisse, ‘Lieferstatistik,’ 11 January 2022, https://www.cemsuisse.ch/app/uploads/2022/01/Lieferstatistik-4.-Quartal-2021.pdf

WSA, ‘December 2021 crude steel production and 2021 global crude steel production totals,’ 25 January 2022, https://worldsteel.org/media-centre/press-releases/2022/december-2021-crude-steel-production-and-2021-global-totals/

MPA, ‘Low carbon multi-component cements for UK concrete applications,’ July 2018, https://prod-drupal-files.storage.googleapis.com/documents/resource/public/Low%20carbon%20multi-component%20cements%20for%20UK%20concrete%20applications%20PDF.pdf

European Commission, ‘European Training Network for Zero-waste Valorisation of Bauxite Residue (Red Mud),’ 16 July 2020, https://cordis.europa.eu/project/id/636876

European Commission, ‘Industrial Residue Activation for sustainable cement production,’ 16 February 2022, https://cordis.europa.eu/project/id/958208

Recycling Portal, Zement der Zukunft – Forschungsprojekt „SAVE CO₂“ gestartet, 28 May 2021, https://recyclingportal.eu/Archive/65677

h2020-NEMO, ‘Project,’ https://h2020-nemo.eu/project-2/

European Commission, ‘Green cement of the future: CemShale + CemTower,’ 14 April 2021, https://cordis.europa.eu/project/id/101009382

CosmoCem, ‘Communiqué de Presse,’ https://cosmocem.org/

CO₂ Win, ‘C²inCO₂: Calcium Carbonation for industrial use of CO₂,’ https://co2-utilization.net/en/projects/co2-mineralization/c2inco2/

Les Echos, ‘Rendre le ciment moins gourmand en CO₂,’ 21 March 2022, https://www.lesechos.fr/pme-regions/innovateurs/des-substituts-au-clinker-rendent-le-ciment-moins-gourmand-en-co2-1395002

Two stories tie into larger trends this week as Global Cement Weekly says goodbye to 2021. Firstly, the state government of Odisha dropped a bombshell this week with its approval for an 18.75Mt/yr cement plant. Keen readers of the Global Cement Directory should note that, if built, this would be around the 10th largest plant worldwide and possibly the biggest outside of China. Credit to Odisha and India though for showing us how to end the year!

Odisha has been encouraging steel production in recent years. In March 2021 local press reported that Arcelor Mittal Nippon Steel (AMNS) had signed a memorandum of understanding with the state government for a US$6.6bn steel plant in the same district. Notably, a more binding agreement was intended to be signed once land and mining leases had been secured. This week the state said that its High Level Clearance Authority had approved an enlarged plan with AMNS worth US$13.5bn. This includes a 24Mt/yr steel plant and a 18.75Mt/yr cement plant. Both are to be built in phases over seven years. No further word on those land and mining leases though. How this fits into India’s overall plans for net zero CO₂ emissions by 2070 is anyone’s guess. Yet this is another cement project linked to steel production. Readers may recall that steel producer Companhia Siderúrgica Nacional (CSN) Cimentos picked up Holcim’s Brazilian cement plants in September 2021.

The other story of note this week was Cembureau’s calculation that if the European Union (EU) emissions trading scheme (ETS) CO₂ price reached Euro90/t then this could represent up to 15% of a cement plant’s production costs. The European cement association made the calculation using data from Ecorys, WIFO, the National Institute of Economic and Social Research for the EU Commission and Agora Energiewende. It wants the EU to bolster carbon leakage measures as soon as possible to fight rising import rates from outside the region. It is pushing for a delay to phasing out the free allocation in the ETS, bringing forward the proposed carbon border adjustment mechanism (CBAM) and for legislators to tackle rising carbon and energy costs generally. It should be noted that the EU ETS price reached Euro88/t on 8 December 2021 but it has stayed below that level since then.

As mentioned at the start, both of the stories above connect to larger trends, principally the cement sector’s adjustments to meet its sustainability goals. A new cement plant with a readily available supply of ground granulated blast furnace slag, such as a potential AMNS unit might have, can reduce its clinker factor more easily than its competitors. One major story in Europe over the last two years has been the steep increase in the ETS price, and Cembureau is highlighting the problems this has caused its members. Global Cement Magazine has run a number of annual round-ups in the last two issues that cover these issues and others. Dr Robert McCaffrey’s news and trends list for 2021 from the Global Cement LIVE broadcast on 21 December 2021 pulls together many of these ideas and more and is well worth watching.

We’ll finish with a list of the top 10 news stories on the Global Cement website in 2021. This reflects what readers all over the world are interested in at a particular time and the list is also biased towards stories that were published in the first half of the year as they have had more time to gather views. Yet, note, new plants in Africa and South Asia, a cement shortage story, Holcim’s decision to change its name and the problems a European producer, Cementa, has had with its quarrying. All of these touch upon larger themes.

Top 10 news stories on Global Cement website in 2021

1. Dzata Cement bagging plant to open in mid-2021
2. UK faces short-term cement shortage
3. LafargeHolcim shareholders agree to change group name to Holcim
4. SRM Concrete acquires 24 concrete plants in Dallas from Cementos Argos
5. Bestway Cement to build new cement plant in Mianwali
6. ThyssenKrupp abandons sale of ThyssenKrupp Industrial Solutions cement section
7. Holcim launches new corporate brand identity
8. Swedish supreme court rejects application by Cementa to renew mining permit for Slite cement plant
9. Larsen & Toubro wins new 3.5Mt/yr cement plant contract in Rajasthan
10. ACC breaks ground on 2.7Mt/yr Ametha cement plant project

Enjoy the Christmas and New Year break if you have one.

Global Cement Weekly will return on 5 January 2022

India: Finance company ICRA reported all-India cement sales in the first half of the 2022 financial year of 124Mt, up by 22% year-on-year. Mint News has reported that the total value of cement sales rose by 5% in the period compared to the first half of the 2021 financial year. Producers’ raw materials costs rose by 16%, while power, coal and petcoke costs rose by 26% and freight costs rose by 7%. Granulated blast furnace slag (GBFS) and gypsum prices also rose.

ICRA corporate ratings assistant vice president and sector head Anupama Reddy said "Despite some easing in the cost-side pressures, the input costs are likely to remain elevated in the near term, and are expected to exert pressure on operating margins, which are likely to decline by 200 to 230 basis points (BPS) in the 2022 financial year as a whole. While the capacity additions are expected to increase year-on-year in the 2022 financial year, the reliance on debt is likely to be lower owing to the healthy cash generation and strong liquidity of the cement companies. The debt coverage metrics are expected to remain strong in the 2022 financial year."

Finland: Betolar has announced the commencement of trading in its shares on the Nasdaq Helsinki exchange. Betolar launched its Geoprime alkali-activated slag and fly ash-based concrete additive in September 2021.

Tero Ojanperä, chair of Betolar’s board of directors, said “The company has so far been developed with a strong ownership with the aim of creating a significant position for Betolar in the global cement market. The share issue expands our shareholder base and provides a significant capital injection to accelerate Betolar's internationalisation.” He continued “The oversubscription of the share issue signals the market's strong belief that effective market-based solutions to the climate crisis can be found. We thank all the retail and institutional investors who participated in the share issue for their trust."

CEO Matti Löppönen added “The outstandingly successful share issue provides Betolar’s executive management with a supportive mandate to start promoting the green transition in various industries globally. At the same time, it also obliges us to steer the company in line with our strategy, in which trust is constantly strengthening among shareholders and customers, as well as society decision-makers.” He concluded “The Betolar team is strongly committed to taking the growth company to the next level.”

France: Hoffmann Green Cement Technologies has launched H-Iona clinkerless cement, its first cement to be made available to retail customers in bagged form. Dow Jones Institutional News has reported that H-Iona cement production’s CO2 emissions are 150kg/t, according to the producer. It claims that this is just 17% that of ordinary Portland cement (OPC). Hoffmann Green Cement Technologies produces H-Iona, primarily from ground granulated blast furnace slag (GGBFS) and gypsum, heat-free at its fully automated Bournezeau plant.

Co-founder Julien Blanchard and David Hoffmannsaid "By launching H-Iona, the lowest carbon cement on the European market, Hoffmann Green Cement is following its continuous innovation approach.” They added “This is the first low-carbon cement to have received CE marking. Thanks to this ground breaking technology, we are democratising access to low-carbon cement.”

Romania: Liberty Galați said in June 2021 that it exported 50,000t of granulated blast furnace slag (GBFS) to France. The steel company said that a French cement producer will use the GBFS along with clay and gypsum in clinker-free cement production. The alternative cement reduces CO₂ emissions by 80% compared to ordinary Portland cement (OPC), according to the supplier. Liberty Galați’s operations generate 500,000t/yr of GBFS. It says that it has cement industry customers across Europe and Africa.

General Director Aida Nechifor said “Our ambition to become carbon neutral by 2030 involves a new metallurgical route – using direct iron reduction and smelting in electric arc furnaces – increased scrap metal recycling and a transition to domestically-generated green energy. However, we are very happy to be able to ensure that even the by-products of our current production process, such as GBFS, can be used better to help reduce the carbon footprint of other products.”

Germany: Holcim Deutschland, part of Switzerland-based LafargeHolcim, has launched its new ECOPlanet Zero carbon neutral cement. The producer says that it will offset the product’s CO₂ emissions through a peatland rewetting service provided by MoorFutures. The cement also has a low clinker factor due to the use of ground granulated blast furnace slag (GGBFS)-enriched binders.

Cement and binders sales director Matthias von der Brelje said “Holcim has been reducing the specific CO₂ emissions of binders very effectively for decades by using high-quality GGBFS.” He added, “In the future, we want to work with planners, contracting agencies and users to further advance the use of our CO₂-reduced binders. This helps our customers to realise their vision of sustainable building even better. In terms of product technology, the ECOPlanet series also has outstanding - and in some cases even better - properties than Portland cements, for example good workability, light colour, favourable heat development and high fatigue strength.”

UK: HeidelbergCement subsidiary Hanson has installed a solar and wind-powered hydrogen generation demonstration unit at its Port Talbot Regen ground granulated blast furnace slag (GGBFS) plant in Port Talbot in Neath Port Talbot. The company says that the project is part of a collaboration with Swansea University’s Energy Safety Research Institute under the European Research and Development Fund’s Reducing Industrial Carbon Emissions initiative. The hydrogen generated by the installation will replace natural gas in the GGBFS plant’s burners.

Head of sustainability Marian Garfield said, “It is estimated that cement is the source of just under 2% of UK CO₂ emissions. With demand for cement and cement replacement products predicted to increase by 25% by 2030, researchers and industry are working hard to reduce the level of CO₂ emissions associated with production. As a leading manufacturer, we take our responsibility very seriously. In the UK we have already achieved a 30% reduction in CO₂ emissions since 1990 across the business and have set an ambitious new target of a 50% reduction by 2030 from the same baseline. We are constantly looking to improve energy efficiency and carbon reduction at our cement and Regen GGBFS plants, so we are delighted to be involved with this innovative research project.”

UK: DB Group has supplied its Cemfree concrete product to a site in Birmingham, West Midlands for use by the Environment Agency in a flood defence project. It says that the agency will use the concrete “for kerb bedding and backing over several kilometres in conjunction with various recycled products in an effort to reduce the projects’ carbon footprint.” Cemfree is a low carbon concrete made using ground blast furnace slag (GGBS) and pulverised fly ash.

UK: CemFree cement-free concrete has been applied volumetrically for the first time in a 52m3 repair to the Woodford West Viaduct on the M25 London ordbital motorway in Essex. The reason behind the choice of method was the unavailability of batching plants at night, which was the only time that a team of Jackson, DB Group and Axtell employees working on behalf of Connect Plus were permitted to perform the work on the UK’s busiest road. CemFree said that 9.4t of CO2 emissions were cut by comparison to the same project undertaken with ordinary Portland cement (OPC). Jackson director of highways Paul Watson said, “We hope this marks a turning point on the M25 and the wider Highways sector for using low carbon alternatives.”

Cemfree uses 95% ground granulated blast furnace slag (GGBFS) and a 5% alkali activator, removing the need for cement. This gave CO2 emissions of 114kg/t, which the company says is 77% lower than conventional (OPC).